package org.apache.maven.project;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;

import org.apache.maven.model.building.ModelProblem;
import org.apache.maven.model.building.ModelProblemUtils;

/**
 * @author Jason van Zyl
 */
public class ProjectBuildingException extends Exception {
  private final String projectId;

  private File pomFile;

  private List<ProjectBuildingResult> results;

  public ProjectBuildingException(String projectId, String message, Throwable cause) {
    super(createMessage(message, projectId, null), cause);
    this.projectId = projectId;
  }

  /**
   * @param projectId
   * @param message
   * @param pomFile pom file location
   */
  public ProjectBuildingException(String projectId, String message, File pomFile) {
    super(createMessage(message, projectId, pomFile));
    this.projectId = projectId;
    this.pomFile = pomFile;
  }

  /**
   * @param projectId
   * @param message
   * @param pomFile pom file location
   * @param cause
   */
  protected ProjectBuildingException(String projectId, String message, File pomFile, Throwable cause) {
    super(createMessage(message, projectId, pomFile), cause);
    this.projectId = projectId;
    this.pomFile = pomFile;
  }

  public ProjectBuildingException(List<ProjectBuildingResult> results) {
    super(createMessage(results));
    this.projectId = "";
    this.results = results;
  }

  public File getPomFile() {
    return pomFile;
  }

  /**
   * @deprecated use {@link #getPomFile()}
   */
  public String getPomLocation() {
    if (getPomFile() != null) {
      return getPomFile().getAbsolutePath();
    } else {
      return "null";
    }
  }

  public String getProjectId() {
    return projectId;
  }

  public List<ProjectBuildingResult> getResults() {
    return results;
  }

  private static String createMessage(String message, String projectId, File pomFile) {
    StringBuilder buffer = new StringBuilder(256);
    buffer.append(message);
    buffer.append(" for project ").append(projectId);
    if (pomFile != null) {
      buffer.append(" at ").append(pomFile.getAbsolutePath());
    }
    return buffer.toString();
  }

  private static String createMessage(List<ProjectBuildingResult> results) {
    StringWriter buffer = new StringWriter(1024);

    PrintWriter writer = new PrintWriter(buffer);
    writer.println("Some problems were encountered while processing the POMs:");
    for (ProjectBuildingResult result : results) {
      for (ModelProblem problem : result.getProblems()) {
        writer.print("[");
        writer.print(problem.getSeverity());
        writer.print("] ");
        writer.print(problem.getMessage());
        writer.print(" @ ");
        writer.println(ModelProblemUtils.formatLocation(problem, result.getProjectId()));
      }
    }
    writer.close();

    return buffer.toString();
  }

}
